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ASTM E1265-04(2013)

(Test Method)

Standard Test Method for Measuring Insertion Loss of Pneumatic Exhaust Silencers

Standard Test Method for Measuring Insertion Loss of Pneumatic Exhaust Silencers

SIGNIFICANCE AND USE
5.1 This test method permits the evaluation of both the acoustical and mechanical performance of pneumatic exhaust silencers designed for quieting compressed gas exhausts (usually air). The data can be used by manufacturers to assess or improve their products, or by users to select or specify a silencer. The data acquired using this measurement method allow for performance comparisons of competitive products and aid in the selection of an appropriate device.  
5.2 Flow rate is an important parameter to consider when the application involves machinery or equipment that requires compressed air or other gases to be exhausted rapidly. For example, in an automatic pneumatic press, compressed air must be exhausted rapidly to avoid a premature second cycle. For this reason, flow ratio is reported in addition to acoustical performance.
SCOPE
1.1 This test method covers the laboratory measurement of both the acoustical and mechanical performance of pneumatic exhaust silencers designed for quieting compressed gas (usually air) exhausts from orifices connected to pipe sizes up to 3/4 in. NPT. This test method is not applicable for exhausts performing useful work, such as part conveying, ejection, or cleaning. This test method evaluates acoustical performance using A-weighted sound level measurements.  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 8.

General Information

Status
Historical
Publication Date
31-Jan-2013
ICS
17.140.01 - Acoustic measurements and noise abatement in general
Technical Committee
E33 - Building and Environmental Acoustics
Drafting Committee
E33.08 - Mechanical and Electrical System Noise
Current Stage
Ref Project

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ASTM E1265-04(2013) - Standard Test Method for Measuring Insertion Loss of Pneumatic Exhaust SilencersASTM E1265-04(2013) - Standard Test Method for Measuring Insertion Loss of Pneumatic Exhaust Silencers
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ASTM E1265-04(2013) - Standard Test Method for Measuring Insertion Loss of Pneumatic Exhaust Silencers
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: E1265 − 04 (Reapproved 2013)
Standard Test Method for
1
Measuring Insertion Loss of Pneumatic Exhaust Silencers
This standard is issued under the fixed designation E1265; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope S1.33 Engineering Methods for the Determination of Sound
Power Levels of Noise Sources in a Special Reverberation
1.1 This test method covers the laboratory measurement of
Room
both the acoustical and mechanical performance of pneumatic
B2.1 Taper Pipe Thread (NPT)—Standard Designation for
exhaust silencers designed for quieting compressed gas (usu-
Tapered Pipe Threads
3
ally air) exhausts from orifices connected to pipe sizes up to ⁄4
in. NPT. This test method is not applicable for exhausts 2.3 Federal Standard:
RulesandRegulations—HandandPortablePowerToolsand
performing useful work, such as part conveying, ejection, or
4
cleaning. This test method evaluates acoustical performance Equipment
using A-weighted sound level measurements.
3. Terminology
1.2 The values stated in inch-pound units are to be regarded
3.1 Definitions—For definitions of terms used in this test
as standard. The values given in parentheses are mathematical
method, see Terminology C634. Particular terms of interest
conversions to SI units that are provided for information only
are: sound level and average sound pressure level.
and are not considered standard.
3.2 Definitions of Terms Specific to This Standard:
1.3 This standard does not purport to address all of the
3.2.1 flow ratio—the ratio of gas flow with the pneumatic
safety concerns, if any, associated with its use. It is the
exhaust silencer installed relative to flow of the unrestricted
responsibility of the user of this standard to establish appro-
pipe.
priate safety and health practices and determine the applica-
3.2.2 flow resistance—the reduction of fluid flow caused by
bility of regulatory limitations prior to use. Specific precau-
various restrictions, surface roughness, devious paths,
tionary statements are given in Section 8.
obstacles, etc. This term is sometimes referred to as “back
2. Referenced Documents
pressure.”
2
2.1 ASTM Standards: 3.2.3 Discussion—For this test method back pressure is a
C634 Terminology Relating to Building and Environmental
qualitative term, therefore, there is no need to measure.
Acoustics
3.2.4 insertion loss of a pneumatic exhaust silencer (at a
3
2.2 ANSI Standards:
specific supply pressure)—the difference in average
S1.4 Specification for Sound Level Meters
A-weighted sound levels measured with and without the
S1.13 Method for the Measurement of Sound Pressure
pneumatic exhaust silencer installed on an unrestricted or
Levels
“open” pipe.
S1.31 Precision Method for the Determination of Sound
3.2.5 Discussion —Insertion loss, as defined in this test
PowerLevelsofBroad-BandNoiseSourcesinReverbera-
method, differs from the definition in Terminology C634.As
tion Rooms
stated in 1.1, this test method uses A-weighting rather than
discrete frequency bands. It compares a set of sound pressure
1 data measured in a reverberation room rather than determining
ThistestmethodisunderthejurisdictionofASTMCommitteeE33onBuilding
and Environmental Acoustics and is the direct responsibility of Subcommittee
absolute sound power levels. This test method is intended to
E33.08 on Mechanical and Electrical System Noise.
assess the difference in sound regenerated at the pipe orifice
Current edition approved Feb. 1, 2013. Published February 2013. Originally
ε1 and does not evaluate sound propagating along the pipe
approved in 1988. Last previous edition approved in 1995 as E1265 – 90 (1995) ,
interior.
which was withdrawn July 2004 and reinstatedAugust 2004. DOI: 10.1520/E1265-
04R13.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4
Standards volume information, refer to the standard’s Document Summary page on This United States Occupational Safety and HealthAdministration Regulation,
the ASTM website. Federal Register, Vol 36, Number 105, Part II, p. 10653, May 1971, is available
3
Available from American National Standards Institute (ANSI), 25 W. 43rd St., from Superintendent of Documents, Government Printing Office, Washington, DC
4th Floor, New York, NY 10036, http://www.ansi.org. 20402–9371.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E1265 − 04 (2013)
3
NOTE 1—Reverberation rooms as small as 17 m are
...

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5.1 The speech privacy between locations in an open plan space is determined by the degree to which intruding speech sounds exceed the ambient sound pressure levels at the listener's ear; a classic signal-to-noise ratio situation.  
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Standard Test Method for Normal Incidence Determination of Porous Material Acoustical Properties Based on the Transfer Matrix Method

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5.1 There are several purposes of this test:  
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5.3 Transmission loss is not only a property of a material, but is also strongly dependent on boundary conditions inherent in the method and details of the way the material is mounted. This must be considered in the interpretation of the results obtained by this test method.  
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ASTM E1179-13(2019)(Specification)
Standard Specification for Sound Sources Used for Testing Open Office Components and Systems

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This specification states the requirements for sound sources used for measuring the speech privacy between open offices or for measuring the laboratory performance of acoustical components. The sound source shall be a loudspeaker enclosed in a box that has a maximum dimension of 0.30 m (1 ft) on a side, to reduce spurious sound reflections. The measurements shall be carried out in a free sound field. The measurement microphone, amplifier, and level meter used to measure sound pressure levels shall satisfy the requirements prescribed. When the sound source is driven with the qualification signal, the sound output shall be adequate to maintain one-third octave-band sound pressure levels at least 10 dB above the corresponding background noise in each band at each measurement location. The directivity of the sound source shall be verified by driving the source with the qualification signal and measuring the sound pressure levels at measurement points.
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1.1 This specification states the requirements for sound sources used for measuring the speech privacy between open offices and for measuring the laboratory performance of acoustical components (see Test Methods E1111 and E1130).  
1.2 The sound source shall be a loudspeaker located in an enclosure driven with an appropriate test signal.  
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Standard Classification for Determination of Articulation Class

SIGNIFICANCE AND USE
4.1 Each weighting factor given in Table 1 represents the fraction of overall speech intelligence contained within the associated one-third octave frequency band.  
4.2 The weighting factors in Table 1 are obtained by multiplying each individual one-third octave band weighting factor of ANSI S3.5-1969 by 300. Articulation class (AC) values are thus related to but distinctly different from articulation index (AI) values. In particular, the AC considers only the effect of signal attenuation; while the AI considers such additional factors as speech level and spectrum and background sound level and spectrum.
Note 2: The AC is similar to the DAI rating proposed by Warnock6 and has been shown to correlate with AI values derived from ANSI S3.5, except where the AI approaches 1 or 0 (AI values range between 1 and 0 and approach 0 with increasing privacy and nonintelligibility). Articulation class values give the reverse. They usually exceed 100 and increase with increasing privacy and nonintelligibility. Extensive comparison between AC ratings and subjective judgments of open-plan speech privacy has not yet been accomplished.
SCOPE
1.1 This classification provides a single figure rating that can be used for comparing building systems and subsystems for speech privacy purposes. The rating is designed to correlate with transmitted speech intelligence between office spaces.  
1.2 Excluded from the scope of this classification are applications involving female speakers or children,2 languages other than English, and sound spectra other than speech. Thus excluded, for example, would be comparisons of building systems or subsystems for their effectiveness in reducing transmitted noise from machinery, industrial processes, bowling alleys, music rooms, places of entertainment, and the like.  
Note 1: Published work by Pearsons, et al, may eventually permit the restriction on female speakers to be relaxed.3  
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM E1704-95(2018)(Guide)
Standard Guide for Specifying Acoustical Performance of Sound-Isolating Enclosures

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5.1 This guide can be used to produce a specification for the acoustical performance of an enclosure.  
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5.3 Although this guide provides detailed guidance in matters relating to specification of acoustical enclosures, it is not a substitute for the experience and judgment of an acoustical or noise control professional.  
5.3.1 This guide calls for measurements common within acoustical practice.  
5.3.2 The more critical the performance requirements of the enclosure, the more the user should consider seeking the services of an acoustics or noise control professional.  
5.4 The specifying of a sound-isolating enclosure has three sequential steps:  
5.4.1 Determine the sound pressure levels that exist at specific locations prior to the introduction of the enclosure,
Note 1: In the case of new construction, the sound pressure level is often estimated from the sound power levels of noise-emitting equipment and a general description of the acoustical properties of the environment.  
5.4.2 Determine the maximum permissible sound pressure levels that must exist at the same locations after the introduction of the enclosure, and  
5.4.3 Determine the required enclosure level reduction. The required isolation is related to the difference between the sound pressure levels before and after the introduction of the enclosure.  
5.5 Many specifications are for multiple enclosures or enclosures with multiple functions, or both. It is beyond the scope of this guide to provide detailed guidance for every possible combination. Separate specifications for each source-enclosure-receiver combination should be used in such a case.  
5.6 The type of specification that should be selected depends both on the purpose of the enclosure and how crucial its performance is. In general:  
5.6.1 If exceeding a particular maximum permissible sound pressure level spectrum would render the enclosure unsuccessf...
SCOPE
1.1 The guide covers the development of criteria for the acoustical performance of a broad variety of acoustical enclosures by identifying information necessary to unambiguously describe acoustical performance. This guide is not a standard ASTM specification for a sound-isolating enclosure.  
1.2 Excluded from the scope of this guide are technical considerations for enclosure design that do not pertain directly to acoustical performance.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Guide
    7 pages
    English language
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